GENERAL
(a) A headset consists of a communication
device that includes two earphones to receive and a microphone to transmit
audio signals to the helicopter’s communication system. To comply with the
minimum performance requirements, the earphones and microphone should match
the communication system’s characteristics and the flight crew compartment
environment. The headset should be adequately adjustable in order to fit the
flight crew’s head. Headset boom microphones should be of the noise cancelling
type.
(b) If the intention is to utilise noise
cancelling earphones, the operator should ensure that the earphones do not
attenuate any aural warnings or sounds necessary for alerting the flight crew
on matters related to the safe operation of the helicopter.
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